Sewing-machine stop-motion.



No- 829,208. 7 PATENTED AUG. 21, 1906. C. J. W. HAYES & C. J. SIEBERT. SEWING MACHINE STOP MOTION.

APPLICATION IILBD NOV. 4, 1901.

WITNESSES I a". 144%,

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THE "mums PETERS co., WASHINGTON. a. c

UNITED sT pEs PATENT OFFICE.

CHARLES 1V. HAYES AND CHARLES J. SIEBERT, OF DETROlT, MICHIGAN.

Specification of Letters Patent.

Patented Aug. 21, 1906.

Application filed November 4, 1901. Serial No. 81,017.

To all whom it may concern:

Be it known that we, CHARLES J. W. HAYES and CHARLES J. SIEBERT, citizens of the United States, residing at Detroit, county of Wayne, State of Michigan, have invented a certain new and useful Improvement in Sewing-Machine Stop-Motions and we declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

This invention relates to sewing-machines, and has for its object an improved attachment intended to stop the machine in case the thread breaks. It is an attachment which is intended to be applied to machines run by power and especially in places where an attendant is not always at hand to act immediately in case of the breaking of the thread.

In the drawings, Figure 1 is a horizontal section through the attachment and through the vertical part of the arm of the sewing; machine. Fig. 2 is a detail elevation, partly in section, showing parts immediately connected with the tension device of the machine. Fig. 3 is a detail of a part of the tubular guide 3 of Figs. 1 and 2. j A indicates the bed of the sewingmachine B the vertical part of the arm. D is the tripping-lever employed to stop the machine. E indicates a part of the arm, and F indicates the tension held by spring H. All these parts are in common use on many classes of machines and need not be further described. To a convenient part of the machine we attach a casing 1, bored to contain a cylinder 2. The vertical shaft C actuates an oscillating arm 4, to the end of which is pivoted a plunger-rod 5. The plunger-rod is arranged to be axially in alinement with the cylinder 2, and the cylinder 2 is provided with a doubleheaded reciprocatory valve 6, having space sufficient between the heads to include between them openings to passages 7 and 8 or passages 7 and 9, as the case maybe. The inlet-passage 7 is arranged to lead always into the chamber between the two heads of the valve 6. On that end of the doubleheaded valve 6 which lies toward the rod 5 is secured a projection 10, that extends toward the rod 5 and is bored so that there is a cavity in its end large enough to easily receive the end of the rod 5. The end of the projection is faced squarely off and hardened to receive the end thrust of the rod 5 under conditions to be hereinafter described.

A tubular or sleeve-like guide 3 is held by a bracket from the casing 1. At one end the sleeve is provided with a slot 20, through which engages the rod 5. The opposite end of the guide reaches near to a cam-shaped hub of a lever 12, that is fulcrumed or pivoted on a pin 31, upon which are mounted the tensiondisks F. The pin projects centrally from an adjusting-stud K, which is rotatable in a barrel 32, that is held in the arm E of the machine. The end of the sleeve-guide 3 engages through the wall of the barrel 32 and is held thereby and also serves to hold the barrel itself from rotation. Between the lever 12 and the stud K is a coil-spring one end of which is secured to the stud and the other end of which is secured to the lever, and the tension of the spring is adjusted by turning the stud in the barrel and securing it in its place of adjustment by the set-screw 33. The long end of the lever 12 is provided with an eye 1 3, through which the thread is passed. An adjustable stop 16, pivoted to the arm E, engages under the long arm of the lever 12 and adjusts its proper movement or when the pin-carrying end is elevated holds it out of action. The rod 5 passes through the guide-tube 3, through a slot 20 in said tube, and between the lower end of the rod 11 and the'upper end of the short piece of rod 19 that engages over a spring 21. The spring 21 tends to push the rods 19 and 11 and the rod 5 upward, throwing rod 5 out of alinement with hole in projection 10 and pressing rod 11 against the cam end of lever 12.

At each stroke of the needle the take-up on the machine pulls the thread tightly and lifts the end of the lever 12 and turns the cam on the end of the lever. The cam engages the end of the rod 11 and pushes it through the sleeve. The movement of the rod in turn guides the rod 5 out of its position of engagement and shifts it into position to engage in the longitudinal hole of the piece 10. At the same time the oscillation of the arm 4 has reciprocated the rod 5, and the rod 5 engages in the cavity in the piece 10 without actuating it. Whenever the thread breaks anywhere between the tension and the work, the takeup does not pull the thread sufiiciently taut to actuate the lever 12 and the rod 5 is not guided into the cavity in which it normally engages, but strikes against the end of the piece 10, causing the double-headed valve to engage over the openings to 9 and 7 instead of openings to 7 and 8.

Air under pressure 18 forced into the passage 7 and normally passes through the passage 8; but in case of the breakage of the thread the valve is thrown and the direction of the air is changed and it passes through the passage 9 and is conducted through pipe 25 into a cylinder 26, where it engages behind a piston 27, which it actuates, pushing the projecting rod 28 against the tripping-lever D, actuating the brake mechanism of the machine to stop it. The valve may also be actuated by hand by a lever (shown in section) pivoted in the unbored end of valve 6. The valve 6 is returned to its normal position when it is desired to start the machine by pressure of the finger of the operator on the free end of the valve.

It should be understood that we do not intend to confine ourselves to the use of air only in the application of this mechanism. Various fluids may be employed.

What we claim is 1. The combination with a stop mechanism for a stitch-forming device ofa controller for said stop mechanism, comprising a fluid actuated plunger arranged to engage the stop mechanism, a valve controlling the flow of fluid, a constantly-reciprocating rod arranged to normally engage said valve without actuating the same, a second reciprocating rod actuated by the take-up of the stitchforming mechanism'arranged to engage the first reciprocating rod and normally guide it to its non-actuating engagement with the valve, whereby abnormal action of said takeup produces an abnormal action of the rods and causes the first-mentioned reciprocating rod to actuate the fluid-valve, substantially as described.

2. In a controller for a stop mechanism of the class described, the combination of a valve, a reciprocatory rod arranged to normally engage without actuating said valve, means actuated by the take-up of the stitchforming machine for normally guiding said rod into its non-actuating position and means for throwing said reciprocating rod into an actuating position when the take-up of the machine fails to act or acts abnormally, substantially as described.

3. In combination with the stop mechanism of a stitch-forming device, said mechanism being provided with a tripping-lever, a controller therefor, having in combination a plunger arranged to engage said trippinglever, means for actuating the same, a reciprocating rod arranged to normally engage the actuating means, a guide controlled by the thread takeup of the stitch-forming mechanism, arranged to normally guide the reciprocating rod out of engagement with said actuating means, and under conditions of abnormal tension, to engaging position, substantially as described.

In testimony whereof we sign this specification in the presence of two witnesses.

Witnesses:

CHARLES F. BURTON, MAY E. KoTT. 

